millspaugh



Dec. 1931- w. H. MILLSPAUGH 1,834,470

S UCTION ROLL Filed p 1926 2 Sheets-Sheet l gnva'nfot William /7. Mz'lifpacyk 35% M02 M Dec. 1 1931. w. H. MILLSPAUGH SUCTION ROLL Filed Sept. 28, 1926 2 Sheets-Sheet 2 Patented Dec. 1, v 1931 UNITED 'STATES PATENT OFFICEQ WILLIAM H. MILLSPAUGH, OF SANDUSKY, OHIO, ASSIGNOR TO THE PAPER & TEXTILE MACHHVERY COMPANY, OF SANDUSKY, OHIO,'A CORPORATION OF OHIO SUCTION ROLL Application filed September 38, 1926. Serial No. 138,284.

This invention relates to suction rolls. One ob]ectof the invention is to provide a suction roll which will give improved results in op-- eration, more particularly with respect to distribution of wear between the revolving foraminous shell or cylinder and the suction box or boxes cooperating therewith. A further object is to provide a construction susceptible of accurate manufacture in vrespect to the drilling of the perforations in the metal shell.

Fig. 1 shows an illustrative embodiment of the invention applied for example to one well known-type of suction roll, a portion of which including one of its end bearing structures is shown in side elevation, while a portion of the cylinder and suction box is shown Fig. 2 represents a reduced side elevain section.

SIPtion of the metal shell or cylinder, omitting intermediate portion, and showing certain of the shell perforations at opposite ends.

Fig. 3 shows on an enlarged scale a fragment of the metal shell.

Fig. 4 shows a fra ent of another such shell having perforations of somewhat :dif-

ferent dimensions and spacing from-those shown in the preceding figure. I

I In the drawings A. denotes therotatmg cylinder, which is a foraminous or perforated'metal shell; B is a bearing structure in which one end of the cylinder is journaled;

C is a stationary suction box sup ortedwith 1n this instance is accomplished by means of an arrangement of the shell perforations. Instead of being arranged in annular rows around the cylinder, as was customary in suction roll shells prior to this invention, the perforations are so arranged that those in sequence around the circumference of the cylinder are located at points successively oflset obtainin tion of t e wear between the shell and box:

longitudinally from one-another, or in otherwords the lines or rows of holes around the cylinder are inclined to transverse planes perpendicular to the axis of the cylinder. This isaccomplished by a spiral arrangement of the shell perforations, i. e. by disposing the perforations on an imaginary spiral line or lines winding around the cylinder from end to end; the convolutions of such a spiral being indicated for example in Fig. 2.

- In the several figures of the drawings, the

line XY indicates a plane at right angles to the'cylinder. The line X-Z indicates a spiraLaccording to which the shell perforations are disposed. The angle between said lines indicates the pitch of such spiral, which is preferably such that the space between successive convolutions thereof is the distance between centers of adjacent perforations in the same longitudinal row. Assuming all the or more such imaginary spiral lines winding around the cylinder, it will be apparent that lie in the same'such plane.. An by adopting a spiral of small pitch, the said planes of the centers of the perforations will be closely adjacent. Thus the perforations in sequence around the cylinder will successively traverse the box packings at different though closely adjacent points, thereby avoiding concentration of wear at any particular points and a substantially uniform distribupackings in I contact therewith. This of course tends to maintain the efliciency of the suction roll for vacuum action purposes, and to prolong its durabilty and to lessen maintenance costs.

Referring to Fig. 2, the perforations there- :in shown are arranged in longitudinal rows spaced uniformly around the c 'linder, with the perforations of the indivi ual. rows at uniform distances apart; and the rows themselves are arranged according to a spiral so the centers of the perforations will in genthat successive perforations in each row lie on successive convolutions of animaginary spiral line, and the corresponding perforations of the several rows lie on the same convoluingof perforations of a given size, the shell as illustrated in Figs. 1 and 3 is provided with a second spiralseries of perforations arranged in longitudinal rows alternating with and staggered relative tothe rows of perforations illustrated in Fig. 2, so that the perforations of one rowliebetween and are closely adjacent to the perforations of adjacent rows; Thus in Fig. 3, intermediate rows of perforations such as those commencing at a and c alternate with rows of intermediate perforations such as those commencing at b' and d.

The said intermediate rows of perforations are arranged according to a spiral in the same manner as described withreference to Fig. 2. Thus in this instance there are two spiral series of perforations winding around and around the cylinder, commencingwith the I perforations a and b. For instance, in Fig.

3 the perforations a, c and a 0 are on successive convolutions of one spiral, while the perforations b, d and 6 d are on successive convolutions of another such spiral. This arrangement obtains a greater number and closer spacing of perforations than would be possible with a single spiral series. And the arrangement of the perforations in longitudinal rows is conducive to convenience and accuracy in the operation of drilling the perforations in the shell, since the successive longitudinal rows of perforations may be accurately drilled with a gang of properly spaced drills upon determining the location of the first perforation of each row.

In Fig. 3 the shell perforations are represented as countersunk at their outer ends, as is frequently desirable, more particularly for use in suction couch rolls for paper machines, in order to reduce the external surface area of the shell and thereby obtain the greatest possible effect of the vacuum action on the sheet of paper or material traversing the vacuum area of the suction roll. Where the suction roll is used as a'suction press roll, as for instance in the type'of organiza tion described in U. S. patent to Millspaugh No. 1,163,253 of December 7, 1915, the character and arrangement of perforations shown in Fig. 4 is preferred.

'Obviously the invention is'not'limited to the particular embodiment thereof herein illustrated and described. Features thereof may advantageously be used in various different combinations and subcombinati ns. It will'also be understood that the invention is applicable to various types or constructions of suctionrolls. The particular suction roll selected for, illustration is of the general type described in the Millspaugh U. S. Patent No. 895,283, dated August 4, 1908, reissued April. 12, 1910, as No. 13,100, and has suction box equipment of the type disclosed in, Millspaugh U. S. Patent No. 1,025,822, dated May 7, 1912, to which patents reference is made fordescription of de tailsif desired. However, the nature of the illustrative suction"roll will be readily apparent to those skilled in'the art.

I clainras-my invention:

1. A suction-roll comprising a cooperating shell and box and having the perforations of the shell so arranged that the shellperforations in sequence circumferentially of the shell traverse the box packings at points successively offset from one another longi- .tudinally by a distance not greater than onehalf the diameter of the perforations, so as to distribute the wear between the perforated shell and box.

2. A suction-roll comprising a perforated rotary shell and a stationary box having a packing engaging the inner surface ofthe shell, the perforations in the shell being so arranged that in every revolution of the shell the perforations successively traversing the packing have successively offset paths thereacross, so that the wear of the'shell on the packing is distributed substantially uniformly along the packing.

3." A suction-roll shell having its perforations positioned on two continuous spirals.

4. A suction-roll shell having longitudinal rows of perforations, corresponding perforations of said rows being on a continuous spiral.

5. A suction-roll having its shell perforations arranged so that the perforations 'dis-, tributed about the shell are in general at different distances from the end of the shell or centered on different planes perpendicular to the shell axis.

6. A suction-roll shell having closely distributed perforations, the perforations in sequence circumferentially of the shell being centered on different but closely adjacent planes perpendicular to the axis of the shell so that when the shell is rotated, in contact with a suctionbox the ienforations'succese sively traversing the pac cessively offset paths thereacross for distributing the wear between the sh ll and box packings. g l I 7. A suction-roll shell having its perforations arranged accordingto a spiral of small,

I gs willhave sue-r pitch continuous from end to end of the perforated portion ofthe shell and having a plurality of closely related convolutions about the shell. 1 1

8. A suction-roll shell having uniformly spaced rows of uniformly spaced perforations, corresponding perforations of successive rows being successively offset longitudinally by equal longitudinal distances which are small fractions of the distance between the centers of adjacent perforations of a row.

9. A suction roll having a multiplicity of perforations, with the centers of all the perforations arranged on a single spiral upon the surface of the roll.

10. A suction roll shell having closely distributed perforations arranged in circumferentially extending rows other than circular and of such inclination with respect to a plane at right angles to the shell axis that the perforations in sequence circumferentially of the shell are successively oflset from one another longitudinally by a'clistance not greater than one-Half the diameter of the perforations.

11.- A suction roll shell having its perforations centered on a plurality of intertwined spirals of such pitch that the perforations in sequence circumferentially of the shell are successively offset from one another longitudinally by a distance not greater than one-half the diameter of the perforations.

12. A suction roll shell having closely distributed perforations disposed in circumferentially extending sequences of such obliquity to a plane at right angles to the shell axis that a plurality of longitudinally ofiset perforations intervene between any two perforations centered on the same plane at right angles to the shell axis. I 1 w 13. A suction roll shell having closely distributed perforations disposed in parallel continuous spiral sequences of such pitch that a plurality of longitudinally offset perforations intervene between any two perforations centered on the same planerat right angles to the shell axis. Y

In testimony whereof I aflix my signature.

WILLIAM H. MILLSPAUGH. 

